Accurate determination of physical conditions of interstellar molecular clouds is a crucial step to better understand the life cycle of the interstellar matter and particularly the formation of stars and planets as well as the synthesis of organic molecules that may lead to emergence of life in the universe. A key parameter for the determination of these conditions from interstellar spectra is the calculation of accurate collisional rate coefficients of interstellar molecules with the most abundant species.

Whereas the knowledge of collisional processes has reached a certain level of maturity for collisions involving non-reactive molecules, very few reliable data exist for collisions involving reactive radicals and ions. The computation of such data is a real challenge since inelastic and reactive processes compete during collisions.

In the COLLEXISM project, we plan to overcome this complex problem and to provide collisional data for these radicals and ions in order to derive as much information as possible from the molecular spectra collected by current telescopes. The new data will then be used in radiative transfer models and the predictions will be finally compared to observations in order to derive the abundances of reactive radicals with unprecedented accuracy.


January 2023Michał's PhD defense

Michał Żółtowski defended his thesis and became PhD!

November 2022Benjamin's PhD defense

Benjamin Desrousseaux defended his thesis and became PhD!

February 2022Rafael's recruitment and Maxime's end of contract

Rafael Jara Toro is joining the team as postdoctoral researcher!

October 2021Amélie and Paul's recruitments

Amélie Godard Palluet and Paul Pirlot are joining the team as PhD students!

September 2021Marie's recruitment

Marie Gueguen is officially joining the team as postdoctoral researcher!

December 2020Transfer to Rennes and Maxime's recruitment!

Transfer of the COLLEXISM project to the University of Rennes 1, in the Institut de Physique de Rennes (IPR).
Maxime Gontel is joining the team as PhD student!

October 2019Benjamin and Michał's recruitments

Benjamin Desrousseaux and Michał Żółtowski are joining the team as PhD students!

September 2019Sándor's recruitment

Sándor Demes is joining the team as postdoctoral researcher!

July 2019Start

Official start of the project at the University of Le Havre Normandie, in the Laboratoire Ondes et Milieux Complexes (LOMC).

January 2019Cheikh's recruitment

Cheikh Bop is joining the team as postdoctoral researcher!

November 2018Selection of the project

COLLEXISM project selected by E.U.


Collisional excitation of NH by H2: Potential energy surface and scattering calculations,

J. Chem. Phys. 155, 134303 (2021), by P. Pirlot Jankowiak, Y. N. Kalugina, R. Ramachandran, G. Raffy, P. J. Dagdigian, and F. Lique, Link

Benchmarking an improved statistical adiabatic channel model for competing inelastic and reactive processes,

Journal of Chemical Physics, American Institute of Physics, 2021, 155 (10), pp.104302., by M. Konings, B. Desrousseaux, F. Lique, and J. Loreau, Link

HD-H+ collisions: new statistical and quantum state-to-state studies,

Physical Chemistry Chemical Physics, Royal Society of Chemistry, 2021, 23, pp.19202-19208., by B. Desrousseaux, M. Konings, J. Loreau, and F. Lique, Link